Compound-engine valve.



No. 69l,l6l. Patented Ian. I4, I902.

s. munson. COMPOUND ENGINE VALVE.

' (Application filed July 25, 1899.)

(No Model.)

/N ENTOl? flA wmvEssgs wgmw m: uonms FUCHS col P UNITED STATns ATFNT FFlCEo SWENEY MUNSON, OF ALLIANCE, NEBRASKA.

.COlVlPOUND-ENGINE VALVE.

Sit-EGIFICATION forming part of Letters Patent N 0. 691,161, dated January 14, 1902. Application filed July 25, 1899. Serial No. 725,087. (No, model) To all whom it may concern.-

Be it known that I, SWENEY MUNSON, of Alliance, in the county of Boxbutte and State of Nebraska, have invented a new and Improved Oompound-Engine Valve, of which the following is a full, clear, and exact description.

My invention relates to an improvement in valves for use with compound engines, and comprises the features hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both the figures.

Figure l is a longitudinal sectional elevation taken through the cylinders and the valvechest, and Fig. 2 is a cross-sectional elevation taken through the same parts on the line 2 2 of Fig. 1.

The object of my invention is to provide a valve and corresponding ports which may be used in connection with compound engines and which shall at the same time combine extreme simplicity with certainty of action and good results.

My device is hereinafter shown as applied to that class of compound engines in which the high and low pressure cylinders are placed side by side, preferably combined in the same casting, and the two pistons move uniformly, being connected to a common cross-head.

In the drawings, A represents the highpressure cylinder, and A the low-pressure cylinder.

B represents the highpressnre piston, and B the low-pressure piston, said pistons being provided with piston-rods b and b.

The drawings herewith show a pair of cylinders designed for use upon a locomotive and are therefore shown with one-half of the saddle 0 cast in the same piece therewith after the usual practice. The two cylinders have a common valve-seat and ports leading from each cylinder to said valve-seat, the movement of the steam being controlled by a single valve. The valve seat is provided with a central exhaust-port F, which communicates by means of a passage F, located within the saddle, with the smoke stack. Upon each side of the exhaust-port F are located two intermediate ports which connect the high and low pressure cylinders. These ports are carried about one side of the highpressure cylinder, as is clearly shown in Fig. 2. Upon each side of the intermediate ports E are located high-pressure admission-ports D, said ports being of the usual character and leading from the valve-seat to the ends of the high-pressure cylinder, which is adjacent thereto.

The valve H is a slide-valve, having a central exhaust-port h in its face and an intermediate port it located within its body and extending from one end to the other, the

openings thereof being upon the face of the valve and located a distance apart correspending with the separation of the intermediate ports E in the valve-seat. The outer edges of the valve are provided with whatever lap is desired for controlling the highpressure admission-ports D. When the valve begins to admit or take live steam at one of the ports D, as shown in Fig. 1, the supplementary port it has at the same time uncovered the port E at that side and the other port D, which allows the exhaust from the cylinder A to pass up through port D at the right-hand side of Fig. 1 into the supplementary port it and down through port E at the left-hand side of Fig. 1 into the cylinder A. At the same time theexhaust from cylinder A will pass up through the intermediate port E at the right-hand side of Fig. 1 and into the exhaust-port h in the slide-valve and from that into the smoke-stack through exhaust-port F and the passage F.

The valve herein shown is provided with balancing devices consisting of flanges H, placed upon the back of the valve and provided with a central groove, and of packingbars I, which fit tightly within the grooves in thefianges H and against the inner surface of the steam-chest cover K, whereby the space included between the packing-bars I is cut off from the steam in the steam-chest and the valve relieved of a corresponding pressure. Springs 1 are placed beneath the packingbars I to hold them out against the inner surface of the steam-chest cover. The steamchest cover is centrally provided with a hole is, communicating with this space, so that any steam which may enter will be promptly discharged. A valve so constructed may be completely balanced, so that very little power is required to move it. In such case, however, it will be found that unless provision is made therefor the valve will be lifted somewhat from its seat at the time the exhaust from the high-pressure cylinder enters the intermediate port It. To prevent this, I have provided the valve on each of its sides with a flange H which lies in contact with the valve-seat. Two guide-bars J are also provided, which have flanges overlapping the flanges H These parts are securely bolted or otherwise secured to the surface of the valve-seat and are of such thickness as to snugly engage the top surface of the flange H so that the valve may freely slide but cannot be lifted off of its seat.

The valve is operated by means of a rod L of the usual kind, which passes through one side of the steam-chest K.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A compound engine, having a common valve-seat for the high and low pressure cylinders, the valve-seat having a central exhaust-port, 1W0 intermediate ports located one on each side of the exhaust-port, highpressure admission-ports located outside of the intermediate ports, and a valve havinga central exhaust-port in its face in communication with the exhaust-port in the valve seat, an intermediate portin its body extending over the exhaust-port and having an opening in the face on each side of the exhaustports, bars fitting grooves in the back of the 2. A compound engine having a common valve-seat for the high and low pressure cylinders, the valve-seat having a central exhaust-port, two intermediate ports located one on each side of the exhaust-port, the said ports passing downward on the outside of the high-pressure cylinder to the low-pressure cylinder, and high-pressure admission-ports located outside of the intermediate ports, a valve having a central exhaust-port in its face communicating at all times with the exhaust-port in the valve-seat, and an intermediate port in its body passing over the exhaust-port and having an openingin the face on each side of the exhaust-port, a balancing device on the slide-valve, and means for bolding the slide-valve to its seat, substantially as described.

SWENEY MUNSON. \Vitnesses:

ABRAM T. WHITE, GEORGE W. RIDDLE. 

